The example snippet:: from twisted.internet import gtk3reactor gtk3reactor.install() from twisted.internet import reactor Doesn't work with dev-python/twisted-core-13.0.0[gtk] due to missing gi.repository package. 1. I don't know where to get the missing package (maybe pygobject:3, I haven't tried) 2. maybe it should rather have gtk2 and gtk3 use flags. Reproducible: Always
gi.repository (in gtk3 context) usually stands (more or less) for x11-libs/gtk+[introspection]:3 (and pygobject:3, obviously).
FWICS the current Twisted package (dev-python/twisted) doesn't have GTK+ flags at all.